Type-writer carriage mechanism.



I 1.). CHAP-IN." TYPE WRITER CARRIAGE MECHANISM.

' APPLICATION man SEPT.2. 190a. 1,1 39,1 02., Patented May 11, 1915.

3 SHEET SSHEET I.

J. J. CHAPIN. TYPE WRITER CARRIAGE MECHANISM. APPLICATION FILED SEPT.2, I908.

Patented May 11, 1915.

J. J; CHAPIN.

" TYPE WRITER CARRIAGE MECHANISM.

APPLICATION FILED SEPT. 2, I908- 1, 1 39 1 02. Patented May 11, 1915.

3 SHEETS-SHEET 3- I 1 nn-lu- UNITED STATES PATENT @FFTQE.

JOHN J CHAPIN, OF DETROIT, MICHIGAN, ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, ACO'RPORATION OF MICHIGAN.

TYPE-WRITER CARRIAGE MECHANISM.

msaioe.

Specification of Letters Patent.

Patented May 11. 191 5.

Application filed September 2, 1908. Serial No. 451,366.

To all whom it may concern:

Be it known that I, JOHN J. CHAPIN, a. citizen'of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Type-Writer Carriage .Mechanism of which the following is a specification.

The present invention relates more particularly to the mechanism of a typewriting machine having to do with traverse of the paper carriage to and fro and one object is to put such carriage under better control when the same is shifted by hand, removing any liability of s'uchcarriage getting away from the operator when released. Thus the invention provides for putting the release devices under control of a handle piece whose manipulation requires that the operator shall have his hand interposed in the path of some part of the carriage.

Another object of the invention is to provide an improved mounting of the carriage which will facilitate adjustment for securing a correct position of the platen at all times and will also reduce to the minimum any distortion of imprints due to slight irregularities in the carriage track.

The invention also aims to provide an improved construction for adjusting the tension of the carriage springi With these'and incidental objects in view the invention consists in certain .novel .featuresof construction and combinations of parts the essential elements whereof are recitedin the appended claims and a .pre-

ferred form of embodiment of which is I illustrated in detail in the accompanying drawings and specifically described hereinafter.

Of said drawings Figure 1 represents a fragmentary top plan view of a typewriting machine having the improvements of the present invention; Fig. 2 represents a portion of the machine in rear elevation; Fig. 3 represents a section on the line 3-3 of Fig. 1 ,Fig. .4 is'a-fraginentary sectionalized right side elevation of the carriage; Fig. 5 is a fragmentary sectionalized top plan view; Fig. 6 is a section on line 66 of Fig. 5; Fig. 7 represents the right-hand end portion of the carriage in perspective with a modified construction; Fig. 8 is a sectionalized front elevation of the spring drum for impelling the carriage together with gearing operated thereby; Fig. 9 is a section on the line 99 of Fig. 7; and Fig. 10 is a rear elevation of the spring drum and connected parts.

In said drawings the reference numeral 2 designates the rectangular frame of the carriage and 3 and 4 the front and back way-rods respectively on which the carriage travels. Centrally located on the front bar of this frame is a flat-tread roller 5 traveling on top of said rod 3. In the back part of the carriage frame there are mounted two grooved rollers 6 engaging the-rod 4 and'spaced a distance apart practically equal to the distance each is spaced from the front roller 5. The carriage thus rests on three points upon the way-rods. Lines drawn between these points would produce an equilateral triangle. The center of gravity of the carriage lies within this triangle at all times and the arrangement insures a smooth and, easy travel of the carriage. Furthermore, the platen 7 being located centrally between the front and back parts of the carriage any irregularities in the way-rods which might cause a slight variance in the surface presented to the type will be so far minimized as to render the inexactness of the imprint practically imperceptible. In this connection it should be noted that the carriage is constructed for use in a typewriting machine of the socalled front strike character.

The mounting of the rear rollers 6 provides for accurate adjustment of the carriage so as to secure the proper location of the platen. The rear part of the carriage frame is formed with hanger portions 8 through opposite sides of which are entered screw plugs 9. The rear one of these screw plugs has a smooth bore Whereas the front plug has a tapped bore. A hearing for the roller is introduced through the rear plug and screwed into the front plug, this bearwith enlarged portions 10 on which'the roller turns, a centrally reduced portion 11, and a reduced front end portion 12 which is screw-threaded to engage the front plug. The hub of the pulley abuts the confronting ends of the screw plugs. It will be obvious that by adjusting the screw plugs the pulley can. be shifted or rather the carriage frame shifted with reference to the pulley and thus an accurate adjustment of the platen obtained.

The back way-rod 4 seats in semi-circular sockets 4 of the frame of the machine and is grooved from end to end in the rear side just above these sockets as shown at 4 in Fig. 2. On the rear part of the carriage frame plates 16 are secured around the hanger portions 8, said plates having forwardly bent lower ends forming retaining flanges 17 to run in the groove 15 (4). It will be noted that this construction provides for a full'traverse of the carriage from-one end to the other of the rod 4 without any limitation on account of the connection with the supporting frame-work. At the front the carriage is kept down on the way-rod bv reason of the projection of a finger 18 on the carriage under a fixed scale plate 19 as shown in Fig. 3.

Thecarriage is drawn tothe left by a coiled spring 20 contained within a barrel or drum 21, (Figs. 8 and 9) the latter be ing connected by a tape 22 with the righthand end of the carriage. Said-drum is loosely mounted upon a tubular shaft 23 having an enlargement at the inner end to which the inner end of the spring 20 is fastened. The outer 'end of said spring is engaged with a pin or stud 24 (Fig. 8) projecting from one side of .the drum. A reduced portion of the shaft 23 is screwthreaded to receive an interiorly threaded sleeve 26, a worm gear 27 and a lock nut 28 as shown in Fig. 9,, the worm gear having holes to receive projections on said sleeve. porting bracket 30 and flanged at its inner end to overlie ball bearings between the shaft 23 and the drum 21. Said ball bearings comprise oppositely arranged cones 31 fitting on a reduced portion of the shaft 23,

balls 32 and a V-grooved ring 33 carried by the drum.

It will be obvious that the tension of the spring can be varied by turning the worm gear wheel 27. Mounted in suitablebeare ings in the bracket 30- and a supplemental bracket '34 is a short vertical shaft 35 (Fig. 10) carrying a worm 36 in mesh with said worm wheel. Said shaft is equipped with a knob 37 by which to'turn it as also shown The latter. is journaled in a sup-' prevents retrograde forming a. bail. The pivot pin 53 to which i this arm is secured projects through the carriage frame and there is secured to it an upstanding arm 54 connected by a spring 55 with the carriage frame. which spring acts to hold the rack down. There is loosely mounted upon said pivot pin 53 on the outer side of the arm 54 a lever 56 which extends upward and then forward alongside the car riage frame to a point near the front where it is provided with a finger piece or handle 57. This lever has a pin 58 which projects behind a vertical shoulder 54 on the upstanding arm 54. It will be obvious that depression of the lever 56 will result in a 59 secured to the carriage frame and isaprtured to receive the laterally turnedend 60 of a locking lever 61 located under the side flange of the carriage frame and jointed to a slide rod 62 mounted in a boss 66 formed on the underside of the front flange of the carriage frame, the latter being finished on the upper side as a slideway for a horn 63 connected by a pin 64v with said slide rod, the pin passing through a slot in the carriage frame flange E. A

spiral spring 65 connects the latter with the carriage frame, operating to normally interlock the lever 61 with the lever 56.' It will be obvious that in order to depress the latter lever and lift the rack it will be necessary to first operate the lever 61 so as to unlock the lever 56. To move the lever 61 it is necessary to apply pressure to the horn 63 in a direction opposite that in which the carriage is moved by its spring. The horn serves as a hand-hold for moving the carriage back to the right. The relative location of the horn 63 and fingerpiece 57 is such that with the thumb applied to the former a finger of the same hand can readily be applied to the finger piece 57. Thus the user will of necessity, when releasing the rack. have hold of thecarriage in such manner as to preclude a jumping to the left of said carriage upon the lifting of the rack and with the rack lifted the carriage is at all times under complete control of the user.

In the modified construction shown in Fig. 7, the rack-lifting lever 56 is formed with .an upstanding lip 60' apertured to receive the laterally-turned end of a looking lever 61 pivoted intermediate its ends onv top of the carriage at the right-hand side thereof. This lever at itsforward end is jointed to a short rod 62 which slides through a horn 63 formed on the top of the front part of the carriage frame and serving as a hand-hold for moving the carriage back to the right. The ;o l 62 carries a thumb piece 64: in front of the concave part of said horn and similarly concaved. A spring 65 on said rod behind said thumb piece thrusts the rod to the left keeping the lever 61 engaged with the lever 56. It will be obvious that this modified construc tion serves a similar purpose to the con-- struction first described, for in order to unlock the rack-lifting lever it is necessary for the operator to apply a finger or thumb to the head 64 in front of the horn 63 and move the said head in a direction opposite that in which the carriage is moved by its spring and thus the. operator necessarily gains a hold on the carriage a pro-requisite to release of the segue, which hold will revent any jum in o the carria e u on tile lifting of the ra k. p

It will now be seen that the above-described constructions are well calculated to fulfil the objects primarily stated although it is to be understood that such construe-f tions are susceptible of modification with in the scope of the invention.

. What I claim is:

1. In a machine of the class described, the combination with a laterally movable spring-drawn paper carriage and means for holding it at different positions; of normally locked manipulative means for releasing-the carriage; and an unlocking device operable in the opposite direction to that in which the carriage is moved by its spring.

2. In a machine of the class described, the combination with a laterally movable spring-drawn paper carriage and means for holding it at different positions; of means for releasing the carriage including a handle lever on one end thereof; and a lock for said lever with a handle movable in the opposite direction to that in which the carriage I is moved by its spri 3. In a machine 0 the class described, the combination with a laterally movable spring-drawn paper carriage and means for holding it at different positions; of means for releasing the carriage including a handle lever on one end thereof, a locking lever engaging said handle lever; and a slide piece piece oppositely to the direction in which connected to said locking lever and movable in the opposite direction to that in which the carriage is moved by its spring.

4. In a machine of the class described, the combination with a laterally movable spring-drawn paper carriage and means for holding it at different positions; of means for releasing the carriage including a handle lever on one end thereof, a locking lever engaging said handle lever; and a handle piece slidingly. mounted on the carriage to a limited extent and connected to said locking lever for disengaging the same from the handle lever by movement of the handle the carriage is moved by its spring.

5. In a machine of the class described, the combination'. with alaterally movable spring-drawn paper carriage and means for holding it at different positions including a member pivotally mounted on the carriage to swing up and down; of a handle lever having a one-way connection with said member for lifting it to release the carriage; and manipulative means normally locking said handle lever.

6. In a mhchine of the class described, the combination with a laterally movable spring-drawn paper carriage and means for holding it at different positions including a member pivotallymounted on the carriage to swing up and down; of a radial arm secured to said member; a handle lever pivoted concentrically with the latter and havmanipulative means normally locking thesaid handle lever.

7 In a machine of the class described, the combination of aspring-drawn paper carriage; escapement mechanism including a .105 rack s'wung in the carriage; a radial arm secured to said rack; a handle lever pivoted on the end of the carriage concentrically with the rackand engaging said radial arm;

a locking lever pivoted on the carriage adjacent said handle lever and normally engaged therewith; and a spring-actuated slide piece on the front of the carriage connected to said locking lever and havinga handle by which it mayibe moved to disengage. the latter from the handle lever; substantially as and for the purpose described.

8. In a machine of the class described, the combination of a supporting frame-work; a way-rod secured thereon and longitudinally 12o grooved; and a paper carriage havingrollfers confined to journal bearings and running &

screw plugs engaging said openings, a roller whose hub abuts the confronting ends of said screw plugs, and a journal rod entered through one of the latter and screwing into the other. I

11. In a machine of the class described, the combination of a supporting frame, a way-rod secured therein and longitudinally grooved, a carriage having a roller journaled thereon adapted to roll upon the said way- I rod, means for adjusting the journals of the roller axially, a clip on the carriage and rigid therewith and engaging the groove in the way-rod adjacent the roller.

12. In a machine of the classdescribed, the combination of a way-rod having a longitudinal groove therein, a carriage having a grooved roller engaging the way-rod,

screw /plugs arranged in a frame of the car riage on opposite sides of the roller, a journalfor the roller longitudinally adjustable in the screw plugs, and a clip extending from the carriage frame into the groove of the Way-rod at a point immediately beneath the roller.

13. In (a machine of the class described, the combination with a laterally movable spring-drawn paper carriage, a rack thereon, feeding means normally engaging the rack, a lever on the carriage controlling the engagement of the rack and feeding means, anda lock for said controlling device, comprising a finger piece movable transversely of the plane of movement of said lever.

14. In a machine of the class described, the combination with a laterally movable spring-drawn paper carriage, a rack thereon, feeding means normally engaging the rack, a device on the carriage controlling the engagement of the rack and feeding means, a lock for said controlling device, and handies for the controlling device and lock respectively in close relation to each other.

' JOHN J. GHAPIN.

Witnesses:

J. G. VINCENT, R. S. MInLER'r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

